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Acquisitions/Divestitures - Microelectronics Disposal Group (Details) - Microelectronics business - Discontinued Operations, Disposed of by Means Other than Sale - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Sep. 30, 2015
Discontinued Operations      
Net cash transferred   $ 500 $ 515
Cash consideration transferred, before adjustments     $ 750
Expected      
Discontinued Operations      
Net cash transferred $ 250